SFFS253 December   2021 TIC10024-Q1 , TIC12400-Q1

 

  1.   1
  2.   2
  3.   3
  4.   4
  5.   5

Pin Failure Mode Analysis (Pin FMA)

This section provides a failure mode analysis (FMA) for the pins of the TIC12400-Q1 and TIC10024-Q1. The failure modes covered in this document include the typical pin-by-pin failure scenarios:

Table 4-2 through Table 4-6 also indicate how these pin conditions can affect the device as per the failure effects classification in Table 4-1.

Table 4-1 TI Classification of Failure Effects
ClassFailure Effects
APotential device damage that affects functionality.
BNo device damage, but loss of functionality.
CNo device damage, but performance degradation.
DNo device damage, no impact to functionality or performance.

Figure 4-1 shows the TIC12400-Q1 and TIC10024-Q1 pin diagram. For a detailed description of the device pins, see the Pin Configuration and Functions section in the TIC12400-Q1 or the TIC10024-Q1 data sheet.

GUID-18BF8B18-242E-490F-A38B-23421FA531C1-low.gif Figure 4-1 Pin Diagram

Following are the assumptions of use and the device configuration assumed for the pin FMA in this section

  • All device parameters are within the recommended operating conditions of the datasheet.
    • VDD: 3 V to 5.5 V
    • VS: 4.5 V to 35 V
Table 4-2 Pin FMA for Device Pins Short-Circuited to Ground
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
IN131No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change.B
IN142No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change. B
IN153No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change.B
IN16 4 No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change. B
IN17 5 No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change. B
IN18 6 No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change. B
IN19 7 No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change. B
IN20 8 No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change. B
AGND 9 No effect, this is the intended connected for this pin. D
IN21 10 No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change. B
IN22 11 No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change. B
IN23 12 No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change. B
IN0 13 No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. B
IN1 14 No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. B
/CS 15 Chip select will always be in an active state, and SPI communication will not be possible. B
SCLK 16 The system clock will stuck in a logic-low state, disabling the ability to latch data into the shift register from the SI pin, and not allowing SO data to be available to the controller. B
SI 17 The SI pin will be stuck in a logic-low state not allowing for any data from the controller to be sent through SPI to the TIC12400-Q1. B
SO 18 The SO pin will be stuck in a logic-low state not allowing for communication from the TIC12400-Q1 to the controller to happen. B
VDD 19 The supply for the SPI communication will be at GND, disabling SPI communication. B
CAP_A 20 The internal analog LDO will no longer have output capacitance causing the LDO to be unstable, and the internal supply rail will be stuck at 0V. Excessive current will also flow from VS to GND. B
RESET 21 The device will be permanently in normal operation, so a hardware reset will not be possible. B
CAP_PRE 22 The internal pre-regulator for both the analog and digital LDOs will no longer have output capacitance. This will cause the pre-regulator to be unstable and the internal supply rail will be stuck at 0V. Excessive current will also flow from VS to GND. B
CAP_D 23 The internal digital LDO will no longer have output capacitance causing the LDO to be unstable, and the internal supply rail will be stuck at 0V. Excessive current will also flow from VS to GND. B
/INT 24 The interrupt function will be stuck low, not able to indicate any interrupts including if a switch state changed. B
IN2 25 No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. B
IN3 26 No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. B
IN4 27 No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. B
DGND 28 No effect, this is the intended connected for this pin. D
IN5 29 No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. B
IN6 30 No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. B
IN7 31 No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. B
IN8 32 No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. B
IN9 33 No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. B
IN10 34 No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. B
IN11 35 No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. B
IN12 36 No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. B
VS 37 The main chip supply of the device will be at 0V, and excessive current draw from the VS power supply would occur. B
VS 38 The main chip supply of the device will be at 0V, and excessive current draw from the VS power supply would occur. B
Table 4-3 Pin FMA for Device Pins Open-Circuited
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
IN131The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage.B
IN142The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage.B
IN153The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage.B
IN16 4 The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. B
IN17 5 The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. B
IN18 6 The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. B
IN19 7 The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. B
IN20 8 The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. B
AGND 9 Device unpowered. B
IN21 10 The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. B
IN22 11 The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. B
IN23 12 The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. B
IN0 13 The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. B
IN1 14 The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. B
/CS 15 The SPI controller will not be able to engage the chip select for SPI on MSDI. No SPI communication possible. B
SCLK 16 The SPI controller cannot drive the clock signal to correctly sample SPI communication. No SPI communication possible. B
SI 17 The SPI controller cannot send SPI data to the TIC12400-Q1. No SPI communication possible. B
SO 18 The TIC12400-Q1 cannot send SPI data to the SPI controller. No SPI communication possible. B
VDD 19 SPI power supply unpowered, SPI communication will not work, but rest of device will still function correctly. B
CAP_A 20 The internal analog LDO will have no connection to the output capacitor for stability. Internal analog LDO will not work correctly. B
RESET 21 No controller will be able to drive the reset function on the device. Reset functionality will not be usable. B
CAP_PRE 22 The internal pre-regulator will have no connection to the output capacitor for stability. Internal pre-regulator will not work correctly. B
CAP_D 23 The internal digital LDO will have no connection to the output capacitor for stability. Internal digital LDO will not work correctly. B
/INT 24 External interrupt indication is not available. Controller connected to the TIC12400-Q1 will not be indicated of any interrupts asserted by the TIC12400-Q1. B
IN2 25 The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. B
IN3 26 The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. B
IN4 27 The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. B
DGND 28 Device unpowered. B
IN5 29 The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. B
IN6 30 The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. B
IN7 31 The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. B
IN8 32 The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. B
IN9 33 The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. B
IN10 34 The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. B
IN11 35 The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. B
IN12 36 The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. B
VS 37 Device unpowered. B
VS 38 Device unpowered. B
Table 4-4 Pin FMA for Device Pins Short-Circuited to Adjacent Pin
Pin NamePin No.Shorted toDescription of Potential Failure Effect(s)Failure Effect Class
IN131IN14No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known.B
IN142IN15No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known.B
IN153IN16No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known.B
IN16 4 IN17 No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. B
IN17 5 IN18 No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. B
IN18 6 IN19 No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. B
IN19 7 IN20 No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. B
IN20 8 AGND No device damage, IN20 is meant to monitor a switch connected to GND. IN20 will be unable to determine state change on the connected switch. B
AGND 9 IN21 No device damage, IN21 is meant to monitor a switch connected to GND. IN21 will be unable to determine state change on the connected switch. B
IN21 10 IN22 No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. B
IN22 11 IN23 No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. B
IN23 12 IN0 No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. B
IN0 13 IN1 No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. B
IN1 14 /CS Potential pin damage if IN1 is monitoring a switch connected to battery and the switch is closed. The /CS absolute maximum could be violated. A
/CS 15 SCLK /CS would engage and disengage over and over if SCLK is being serviced by the clock signal from the SPI controller. SPI communication would not be useable. B
SCLK 16 SI SPI communication into the TIC12400-Q1 would not be useable, as the input would be a clock signal that could not be read by the TIC12400-Q1. B
SI 17 SO SPI communication would not be functioning with both the input from the controller and the output to the controller communicating the same information. B
SO 18 VDD SPI communication from the TIC12400-Q1 to the controller would not be possible because it would be stuck in a logic high state. B
CAP_A 20 RESET If RESET is driven high, the internal analog LDO has the potential to become unstable. B
RESET 21 CAP_PRE If RESET is driven high, the internal pre-regulator has the potential to become unstable. B
CAP_PRE 22 CAP_D No failure effect, but the effective capacitance at both outputs will be a different value. C
CAP_D 23 /INT If /INT is pulled up externally, the internal digital LDO has the potential to become unstable. B
/INT 24 IN2 No device damage, but IN2 will be unable to determine state change on the connected switch, and /INT will not be able to properly indicate a switch state change on another INx input or any other interrupt asserted by the TIC12400-Q1. B
IN2 25 IN3 No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. B
IN3 26 IN4 No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. B
IN4 27 DGND No device damage, IN4 is meant to monitor a switch connected to GND. IN4 will be unable to determine state change on the connected switch. C
DGND 28 IN5 No device damage, IN5 is meant to monitor a switch connected to GND. IN5 will be unable to determine state change on the connected switch. C
IN5 29 IN6 No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. B
IN6 30 IN7 No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. B
IN7 31 IN8 No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. B
IN8 32 IN9 No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. B
IN9 33 IN10 No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. B
IN10 34 IN11 No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. B
IN11 35 IN12 No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. B
IN12 36 VS No device damage, IN12 is meant to monitor a switch connected to battery. IN12 will be unable to determine state change on the connected switch. B
VS 37 VS No effect, these pins have the same function. D
Note: This device includes a thermal pad. All device pins are adjacent to the thermal pad. The device behavior when pins are shorted to the thermal pad depends on which net is connected to the thermal pad.
Table 4-5 Pin FMA for Device Pins Short-Circuited to VS
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
IN131No device damage, but the switch input will be unable to determine state change.B
IN14 2 No device damage, but the switch input will be unable to determine state change. B
IN15 3 No device damage, but the switch input will be unable to determine state change. B
IN16 4 No device damage, but the switch input will be unable to determine state change. B
IN17 5 No device damage, but the switch input will be unable to determine state change. B
IN18 6 No device damage, but the switch input will be unable to determine state change. B
IN19 7 No device damage, but the switch input will be unable to determine state change. B
IN20 8 No device damage, but the switch input will be unable to determine state change. B
AGND 9 The device will be unpowered, potential for high current draw on the VS supply. B
IN21 10 No device damage, but the switch input will be unable to determine state change. B
IN22 11 No device damage, but the switch input will be unable to determine state change. B
IN23 12 No device damage, but the switch input will be unable to determine state change. B
IN0 13 No device damage, but the switch input will be unable to determine state change. B
IN1 14 No device damage, but the switch input will be unable to determine state change. B
/CS 15 Absolute maximum violation, SPI chip select may be damaged. Unable to communicate through SPI. A
SCLK 16 Absolute maximum violation, SPI clock may be damaged. Unable to communicate through SPI. A
SI 17 Absolute maximum violation, SPI input to the TIC12400-Q1 may be damaged. Unable to communicate through SPI A
SO 18 Absolute maximum violation, SPI output from the TIC12400-Q1 may be damaged. Unable to communicate through SPI A
VDD 19 Absolute maximum violation, SPI supply pin will be damaged. Unable to communicate through SPI. A
CAP_A 20 Absolute maximum violation, internal analog LDO may be damaged. A
RESET 21 Absolute maximum violation, device RESET pin and function may be damaged. A
CAP_PRE 22 Absolute maximum violation, internal pre-regulator may be damaged. A
CAP_D 23 Absolute maximum violation, internal digital LDO may be damaged. A
/INT 24 No deivice damage, but external indication for a switch input changing state will no longer be available while short is present. B
IN2 25 No device damage, but the switch input will be unable to determine state change. B
IN3 26 No device damage, but the switch input will be unable to determine state change. B
IN4 27 No device damage, but the switch input will be unable to determine state change. B
DGND 28 The device will be unpowered, potential for high current draw on the VS supply. B
IN5 29 No device damage, but the switch input will be unable to determine state change. B
IN6 30 No device damage, but the switch input will be unable to determine state change. B
IN7 31 No device damage, but the switch input will be unable to determine state change. B
IN8 32 No device damage, but the switch input will be unable to determine state change. B
IN9 33 No device damage, but the switch input will be unable to determine state change. B
IN10 34 No device damage, but the switch input will be unable to determine state change. B
IN11 35 No device damage, but the switch input will be unable to determine state change. B
IN12 36 No device damage, but the switch input will be unable to determine state change. B
VS37No failure, this is the intended use for this pin.D
VS38No failure, this is the intended use for this pin.D
Table 4-6 Pin FMA for Device Pins Short-Circuited to VDD
Pin Name Pin No. Description of Potential Failure Effect(s) Failure Effect Class
IN13 1 No device damage, but logic voltage bias would interfere with the switch input sensing. C
IN14 2 No device damage, but logic voltage bias would interfere with the switch input sensing. C
IN15 3 No device damage, but logic voltage bias would interfere with the switch input sensing. C
IN16 4 No device damage, but logic voltage bias would interfere with the switch input sensing. C
IN17 5 No device damage, but logic voltage bias would interfere with the switch input sensing. C
IN18 6 No device damage, but logic voltage bias would interfere with the switch input sensing. C
IN19 7 No device damage, but logic voltage bias would interfere with the switch input sensing. C
IN20 8 No device damage, but logic voltage bias would interfere with the switch input sensing. C
AGND 9 Supply to SPI will be at ground, SPI will be unpowered. SPI communication not possible. B
IN21 10 No device damage, but logic voltage bias would interfere with the switch input sensing. C
IN22 11 No device damage, but logic voltage bias would interfere with the switch input sensing. C
IN23 12 No device damage, but logic voltage bias would interfere with the switch input sensing. C
IN0 13 No device damage, but logic voltage bias would interfere with the switch input sensing. C
IN1 14 No device damage, but logic voltage bias would interfere with the switch input sensing. C
/CS 15 The SPI chip select pin will be stuck in the logic high state. SPI communication cannot be enabled. B
SCLK 16 The SPI clock will be stuck in a logic high state. SPI data will not be able to be clocked in. SPI communication will not be possible. B
SI 17 SPI communication from the controller to the TIC12400-Q1 would not be possible because the data in would be stuck in a logic high state. B
SO 18 SPI communication from the TIC12400-Q1 to the controller would not be possible because it would be stuck in a logic high state. B
VDD 19 No effect, this is the intended use of this pin. D
CAP_A 20 Internal analog LDO will be biased to VDD voltage. No device damage but LDO may become unstable. C
RESET 21 RESET pin will be stuck in a logic high state, keeping the device in a hardware reset state. All functionality will be lost. B
CAP_PRE 22 Internal pre-regulator will be biased to VDD voltage. No device damage but pre-regulator may become unstable. C
CAP_D 23 Internal digital LDO will be biased to VDD voltage. Device damage possible, and LDO may become unstable. A
/INT 24 Interrupt pin will be stuck high and unable to externally indicate a switch input state change. B
IN2 25 No device damage, but logic voltage bias would interfere with the switch input sensing. C
IN3 26 No device damage, but logic voltage bias would interfere with the switch input sensing. C
IN4 27 No device damage, but logic voltage bias would interfere with the switch input sensing. C
DGND 28 No device damage, but logic voltage bias would interfere with the switch input sensing. C
IN5 29 No device damage, but logic voltage bias would interfere with the switch input sensing. C
IN6 30 No device damage, but logic voltage bias would interfere with the switch input sensing. C
IN7 31 No device damage, but logic voltage bias would interfere with the switch input sensing. C
IN8 32 No device damage, but logic voltage bias would interfere with the switch input sensing. C
IN9 33 No device damage, but logic voltage bias would interfere with the switch input sensing. C
IN10 34 No device damage, but logic voltage bias would interfere with the switch input sensing. C
IN11 35 No device damage, but logic voltage bias would interfere with the switch input sensing. C
IN12 36 No device damage, but logic voltage bias would interfere with the switch input sensing. C
VS 37 Potential absolute maximum violation on VDD pin, SPI supply pin will be damaged. Unable to communicate through SPI. A
VS 38 Potential absolute maximum violation on VDD pin, SPI supply pin will be damaged. Unable to communicate through SPI. A